Correct the test case data to expect a granulepos of -1 on pages where
no packet ends. The spec is clear about this but the unit tests assumed
the old behaviour (carry over the previous granulepos) was correct.
I did not verify the new CRC values by hand however, they are just copied
from the library output.
Also update changelog for the bug fix.
git-svn-id: http://svn.xiph.org/trunk/ogg@9601 0101bb08-14d6-0310-b084-bc0e0c8e3800